Hot Rod Forum banner
21 - 25 of 25 Posts

· Registered
Joined
·
2 Posts
Originally posted by tomslik:
<strong>Zeke, if it's (HAMB)is just for "traditionalist" what am I doing there?
you've prolly seen my stuff and not much of it is "traditional"..
</strong><hr></blockquote>

Hell Tom, I don't even know why I'm there but it sure can be fun place to be.

Join the "Dark Side" of hot rodding, we don't bite(well not to hard).

Zeke
 

· aka Duke of URL
Joined
·
5,202 Posts
Discussion Starter · #22 ·
Originally posted by KULTULZ:


<strong>I came across this post on another message board, but thought some of you might find this interesting. The poster had a catastrophic failure with his crossmember (Heidt's) and his dealings with the manufacturer.

<a href="http://www.jalopyjournal.com/ubb/Forum1/HTML/026126.html" target="_blank">-Suspension Component Failure-</a></strong><hr></blockquote>

Here is an additional post;

<a href="http://www.jalopyjournal.com/ubb/Forum1/HTML/027318.html" target="_blank">-Another Failure-</a>

I am not blasting any manufacturer...just trying to bring this information to your attention...
 

· Registered
Joined
·
6,453 Posts
Another case of strut rod eliminators gone bad. <img src="graemlins/drunk.gif" border="0" alt="[drunk]" />

Centerline
http://www.hotrodsandhemis.com
 

· Premium Member
Joined
·
10,874 Posts
Originally posted by KULTULZ:
<strong>

Here is an additional post;

<a href="http://www.jalopyjournal.com/ubb/Forum1/HTML/027318.html" target="_blank">-Another Failure-</a>

I am not blasting any manufacturer...just trying to bring this information to your attention...</strong><hr></blockquote>


I'm ready to go on record saying this front crossmember is a bad design and should be avoided or at least modified to give it a better chance to survive. This failure is identical to the one in the original post. Fatigue crack started at the sharp inside corner formed by the intersection of the bottom and side plates. They could go a long way just by continuing the bottom plate all the way up the riser of the side plates. Again, I don't like strut rod eliminators - too much of a major modification from the original design. Note that lower A arms on front ends w/o strut rods are very wide and robust. The MII x-member is very narrow with the intention of having strut rods to give the wide base and fatigue resistance.

[ December 02, 2002: Message edited by: [email protected] ]</p>
 

· bentwings
Joined
·
3,143 Posts
Hi,
Being a mechanical engineer I have often wondered when something like this would happen. As many of you have observed there may be a problem with the fabricated front cross member..not just this particular mfg. but all in general, since they are all similar. It would seem to me that a days' worth of labor at a design house doing some structrual analysis would be well worth the cost. Besides being able to blow your horn about being "professionally analyized for strength" advertizing. It only took me about 1/2 hour to model up a good likeness of a front crossmember like these.
I 've done some computer modeling of structrual parts and have done stress analysis in my time.. several items survived way over 8,000 g gun launch. If you look at the Must II crosmember in the real car vs. the after market cm. you can readily see the difference. FMC spent a h...l of a lot of $$$ doing this for some reason so I would think that maybe we (us hotrodders) might take some time to look at the thing. They don't spend $$$ they don't have too. The after market piece is much lighter, and cleaner looking. However the cars weighs about the same with about 3 to 10 times the hp. What do we expect??? Lighter, not as well designed (no stress analysis), and a lot higher loads....just asking for problems.
Some of the gussets certainly will help. (TLAR engineering..that looks about right eng.)I think the strut rod is ok too even if it is ugly. Its' hidden under fat fenders anyway. How much do gussets weigh anyway??? couple pounds? So what. not to pretty?.. How do you thing your body will look after a 70 mph crash?...not to pretty either. Plus it hurts like h...l. If you can't do the welding properly have someone who can do it, weld it for you. Pay them a reasonable rate and don't chizzle them. they may save your life. What's that worth $100? $300?? Pick.
My point is don't be afraid to add some gussets. If in doubt ask any mech eng. Even a student can give you a good TLAR opinion that will improve the situation.
Hopefully this problem will be worked out outside of the courtroom or we all will be paying through the nose again for something that is not our fault. We may wind up making our own CM's again. What if one of these fails??? We may be all driving rice cars made so it will be illegal to open the hood (if it can be opened) if you aren't some kind of certified technician. No more hotrods.
Saftey has to be first guys and gals.

bentwings
 
21 - 25 of 25 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top